The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 26, 2001
Filed:
Dec. 28, 1999
Hiroshi Sugie, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A backlash compensation device for use with a numerically controlled system compensates for a position command signal used to drive and control an object to be controlled. The device includes a reversal detecting unit for detecting a reversal of a direction of driving the object to be controlled based on a reversal of an upward or downward trend in the level of an applied position command signal. A maximum backlash signal generating unit generates a maximum backlash signal corresponding to a maximum value of backlash error every time a reversal of a direction of driving the object is detected. A filter then reduces the level of the maximum backlash signal according to how much time has elapsed since the detected reversal of the driving direction. An adder adds the reduced maximum backlash signal from the filter to the position command signal.